idle problem

bobs351 said:

have a question, 98 cobra,
when driving down road its fine come to a stop idle stays up 1300 to 1400 shut it off start it back up it idles right down until you give it gas again any help out there or ideas, thanks

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ViciousBlack97 said:

Sounds like either a pretty bad vacuum leak, or your IAC is failing. I'd try to get it to hang at the high rpm, then tap the IAC with something fairly solid. If it's hanging up, that percussive maintenance should knock it closed and your idle will return to normal.

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ImThatGuy said:

Do you have an aftermarket throttle body by chance? My old cobra did exactly what you mentioned (if not worse) when I put a BBK TB on it.

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